3 particles each of mass m are kept at vertices of an equilateral triangle of side L. The

gravitational field at centre due to these particles is

1. zero                                                                       

2. 3GML2

3. 9GML2                                                                     

4. 123GML2

Subtopic:  Gravitational Field |
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The weight of an object in the coal mine, sea level, at the top of the mountain are  W1,

W2 and W3   respectively, then

1.  W1W2W3                      

2.  W1=W2=W3

3.  W1W2W3                     

4.  W1W2W3      

Subtopic:  Acceleration due to Gravity |
 66%
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The value of escape velocity on a certain planet is 2 km/s. Then the value of orbital speed

for a satellite orbiting close to its surface is:

1. 12km/s                                                                 

2. 1km/s

3. 2  km/s                                                             

4. 22 km/s

Subtopic:  Escape velocity | Orbital velocity |
 75%
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Four particles each of mass M, are located at the vertices of a square with side L. The

gravitational potential due to this at the centre of the square is

1. -32GML                                   

2. -64GML2

3. zero                                             

4. 32GML

Subtopic:  Gravitational Potential |
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The mass of the moon is 7.34×1022kg and the radius is 1.74×106m. The value of

gravitation field will be

1. 1.45 N/kg                               

2. 1.55 N/kg

3. 1.75 N/kg                               

4.  1.62 N/kg

Subtopic:  Gravitational Field |
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The centripetal force acting on a satellite orbiting round the earth and the gravitational

force of earth acting on the satellite both equal F. The net force on the satellite is

1. Zero                                  

2. F

3. F2                                 

4. 2 F

Subtopic:  Satellite |
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Reason of weightlessness in a satellite is:

1. Zero gravity

2. Centre of mass

3. Zero reaction force by satellite surface

4. None

Subtopic:  Satellite |
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Mass M is divided into two parts xM and 1-xM . For a given separation, the value of x

for which the gravitational attraction between the two pieces becomes maximum is

1. 12                                 

2. 35

3. 1                                   

4. 2

Subtopic:  Newton's Law of Gravitation |
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If earth is supposed to be a sphere of radius R, if g30° is value of acceleration due to gravity at latitude of 30o and g at the pole, the value of g-g30ο is

1. 14 ω2R                      

2. 34ω2R

3. ω2R                           

4. 12ω2R

Subtopic:  Acceleration due to Gravity |
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If M the mass of the earth and R its radius, the ratio of the gravitational acceleration and

the gravitational constant is

1. R2M                       

2. MR2

3. MR2                       

4. MR

Subtopic:  Acceleration due to Gravity |
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